Flower Arrangements Roses and Aster Centerpieces The vibrant shades of pink, lavender, red, orange and yellow color roses, accented with the magnificent purple color asters, creates a fantastic and happy look, full of good energy and love!! Most wedding centerpieces should use a vase that measures 5" to 11" inches in height with an opening of 4" to 8" inches wide. You may adjust the distance across the flowers by tying the bouquet in the center or allowing it to stand on its own in the vase depending on the look you want. In all wedding/or special occasion, please order your flowers at least 10 days before the delivery date. Your wedding flowers and wedding roses are shipped absolutely fresh, direct from the greenhouses to you via FedEx or UPS.